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You need to fetch() the record.

No, it isn't. You'll find that the final " is missing after the "sales-channel" $result .= '"'.$order->sales_channel. "\n"; should be $result .= '"'.$order->sales_channel. "\"\n"; That aside, I can't see multiple writes in the function. My guesses at the moment It is being called multiple times, each call writing a single record. It is being call recursively (What does wp_remote_post( admin_url('admin-ajax.php?action=get_batch_orders_from_api') do inside the function?